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Question

The heat of combustion of carbon to CO2 is 393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is:

A
630 kJ
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B
3.15 kJ
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C
315 kJ
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D
+315 kJ
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Solution

The correct option is C 315 kJ
Formation of CO2 from carbon and dioxygen gas can be represented as

C(s)+O2(g)CO2(g);ΔfH=393.5 kJ mol1

(1mol=44g)

Heat released on formation of 44 g CO2=393.5 kJmol1
Heat released on formation of 35.2 g CO2=393.5 kJ mol144g×35.2g=315kJ

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